Thanks! Right now, I am sharing the bike with my kids who are new riders, so I have to be able to tame it down easily. I'm thinking about trying some of the other governor spring holes for a 4000-4400 rpm max, then using the throttle limit screw when the kids ride.
Quiet is also very important as I ride on my neighbors' property and want to be considerate. I did see where someone removed the muffler and "throated" it a bit where it meets the block for better air flow. I might give that a try.
The problem I have with the intake is how much most of them hang off the side of the bike. With the kids driving, I'm sure it would get knocked off, lost, etc. I saw someone use a some type of U bend to get the filter back under the bike which looked good.
I did put a 60 tooth rear sprocket on and it works much better on our hills and tight trails. Not quite a wheelie machine, nor would I want it to be (yet), but it does lighten the front end up nicely when I get on it.
I've got some other projects ahead of it, but I would like to find a cheap roller Baja and do a stage 1 212 with a TC and seat springs, just for Dad!